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Unknown alcohol or phenol was tested in the lab. When chromic acid was added, it turned from orange to green. When FeCl3 was added to a separate portion of the unknown, it turned purple. What can you say about the structure of this unknown?

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Answer:

Explanation:

The compound is phenol . When phenol reacts with FeCl₃ , it forms complex with purple colour .

FeC₃ + C₆H₅OH ------>  Fe(C₆H₅O)₆ + 3H⁺ + HCl

When phenol reacts with chromic acid , it is oxidised to 1,4 benzoquinone or simply quinone.  Colour of solution changes from orange to green.

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